Generation of magnonic squeezed state and its superposition in a hybrid qubit-magnon system

Quantum Physics [Submitted on 3 Apr 2026] Generation of magnonic squeezed state and its superposition in a hybrid qubit-magnon system Gang Liu, Feng Qiao, Rong-Can Yang, Wei Xiong We propose a protocol for generating magnonic squeezed states (MSS) and their superpositions (SMSS) in a hybrid system comprising a superconducting flux qubit magnetically coupled to the Kittel mode of a yttrium iron garnet (YIG) sphere. The flux qubit provides an intrinsic longitudinal interaction with the magnon mode, which, under resonant microwave driving, gives rise to an effective qubit-state-dependent squeezing Hamiltonian. Numerical simulations incorporating realistic dissipation demonstrate that magnon quadrature noise reduction exceeding 8~\mathrm{dB} is achievable with experimentally accessible parameters.~By preparing the qubit in a superposition state followed by projective measurement, we further obtain symmetric and antisymmetric superpositions of orthogonally squeezed magnon states exhibiting clear phase-space interference fringes.~We discuss how the fourfold rotational symmetry of these states supports a bosonic logical encoding with potential for protecting against dominant error channels in magnonic platforms. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.02924 [quant-ph]   (or arXiv:2604.02924v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2604.02924 Focus to learn more Submission history From: Gang Liu [view email] [v1] Fri, 3 Apr 2026 09:44:27 UTC (4,244 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-04 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)